title: Tetra-kis(aceto-nitrile)copper(I) hydrogen oxalate-oxalic acid-aceto-nitrile (1/0.5/0.5).
abstract: In the title compound, [Cu(CH3CN)4](C2HO4)·0.5C2H2O4·0.5CH3CN, the Cu(I) ion is coordinated by the N atoms of four aceto-nitrile ligands in a slightly distorted tetra-hedral environment. The oxalic acid mol-ecule lies across an inversion center. The aceto-nitrile solvent mol-ecule is disordered across an inversion center and was refined with half occupancy. In the crystal, the hydrogen oxalate anions and oxalic acid mol-ecules are linked via O-H⋯O hydrogen bonds, forming chains along [010].
authors.affiliation: Department of Chemistry, University of West Florida, 11000 University Parkway, Pensacola, FL 32514, USA.
authors.forename: A Timothy
authors.initials: AT
authors.lastname: Royappa
authors.forename: Jacob R
authors.initials: JR
authors.lastname: Stepherson
authors.forename: Oliver D
authors.initials: OD
authors.lastname: Vu
authors.forename: Andrew D
authors.initials: AD
authors.lastname: Royappa
authors.forename: Charlotte L
authors.initials: CL
authors.lastname: Stern
authors.forename: Peter
authors.initials: P
authors.lastname: Müller